/* -*- Mode: C; c-basic-offset:4 ; -*- */
/*
 *
 *  (C) 2003 by Argonne National Laboratory.
 *      See COPYRIGHT in top-level directory.
 */
#include "mpi.h"
#include <stdio.h>
#include <stdlib.h>
#include "mpitest.h"

/*
static char MTEST_Descrip[] = "Test of type resized with non-zero LB";
*/

int main( int argc, char *argv[] )
{
    int errs = 0, i;
    int rank, size, source, dest;
    int count; 
    int *buf; 
    MPI_Comm      comm;
    MPI_Status    status;
    MPI_Datatype  newtype;

    MTest_Init( &argc, &argv );

    comm = MPI_COMM_WORLD;

    /* Determine the sender and receiver */
    MPI_Comm_rank( comm, &rank );
    MPI_Comm_size( comm, &size );
    source = 0;
    dest   = size - 1;

    /* Create an type that is "* INT * "
       that is, there is a int-sized pad at the beginning of the type, 
       and the extent is still 3 ints.  Note, however, that the INT
       is still at displacement 0, so the effective pattern i*/
    MPI_Type_create_resized( MPI_INT, -(int)sizeof(int), 3 * sizeof(int), &newtype ); 
    MPI_Type_commit( &newtype );
    for (count = 1; count < 65000; count = count * 2) {
	buf = (int *)malloc( count * 3 * sizeof(int) );
	if (!buf) {
	    MPI_Abort( comm, 1 );
	}
	for (i=0; i<3*count; i++) buf[i] = -1;
	if (rank == source) {
	    for (i=0; i<count; i++) buf[3*i] = i;
	    MPI_Send( buf, count, newtype, dest, 0, comm );
	    MPI_Send( buf, count, newtype, dest, 1, comm );
	}
	else if (rank == dest) {
	    MPI_Recv( buf, count, MPI_INT, source, 0, comm, &status );
	    for (i=0; i<count; i++) {
		if (buf[i] != i) {
		    errs++;
		    if (errs < 10) {
			printf( "buf[%d] = %d\n", i, buf[i] );
		    }
		}
	    }
	    for (i=0; i<count*3; i++) buf[i] = -1;
	    MPI_Recv( buf, count, newtype, source, 1, comm, &status );
	    for (i=0; i<count; i++) {
		if (buf[3*i] != i) {
		    errs++;
		    if (errs < 10) {
			printf( "buf[3*%d] = %d\n", i, buf[i] );
		    }
		}
	    }
	}
    }
    MPI_Type_free( &newtype );

    MTest_Finalize( errs );
    MPI_Finalize();
    return 0;
}
